The U.S. Department of Energy (DOE) supports the development, standardization, and maintenance of calibration facilities for environmental radiation sensors. Radiation standards at the facilities are primarily used to calibrate portable surface gamma-ray survey meters and borehole logging instruments used for uranium and other mineral exploration and remedial action measurements. Standards for calibrating borehole fission neutron devices are also available, but are used infrequently.

Calibration facilities are located at the DOE Site and Grand Junction Regional Airport in Grand Junction, Colorado; Grants, New Mexico; Casper, Wyoming; and George West, Texas; An additional calibration facility located at the DOE Hanford Site near Richland, Washington, is managed by the DOE Office of Environmental Management.

Parties interested in using these facilities may call DOE at (970) 248-6000 for more information and to request access. Visitors who are foreign nationals must complete and submit the Unclassified Foreign National Visits & Assignments Questionnaire 30 days before accessing the facilities. Due to security requirements, advance notification is necessary for users of the Grand Junction Regional Airport Large Area Calibration Pads.